Y. Onose et al 2007 EPL 80 37005 doi:10.1209/0295-5075/80/37005
The Lorenz number in CeCoIn5 inferred from the thermal and charge Hall currents
Y. Onose1, N. P. Ong1 and C. Petrovic2
Show affiliationsThe thermal Hall conductivity κxy and Hall conductivity σxy in CeCoIn5 are used to determine the Lorenz number 
at low temperature T. This enables the separation of the observed thermal conductivity into its electronic and non-electronic parts. We uncover evidence for a charge-neutral, field-dependent thermal conductivity, which we identify with spin excitations. At low T, these excitations dominate the scattering of charge carriers. We show that suppression of the spin excitations in high fields leads to a steep enhancement of the electron mean-free-path, which leads to an interesting scaling relation between the magnetoresistance, thermal conductivity and σxy.
- PACS
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72.20.My Galvanomagnetic and other magnetotransport effects
71.27.+a Strongly correlated electron systems; heavy fermions
72.15.Eb Electrical and thermal conduction in crystalline metals and alloys
- Subjects
- Dates
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Issue 3 (November 2007)
Received 25 June 2007, accepted for publication 5 September 2007
Published 28 September 2007
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The Lorenz number in CeCoIn5 inferred from the thermal and charge Hall currents
Y. Onose et al 2007 EPL 80 37005
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